fs: aio ioprio use ioprio_check_cap ret val

Previously the value was ignored.
Signed-off-by: NAdam Manzanares <adam.manzanares@wdc.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

fs/aio.c

@@ -1443,8 +1443,8 @@ static int aio_prep_rw(struct kiocb *req, struct iocb *iocb)
 		 */
 		ret = ioprio_check_cap(iocb->aio_reqprio);
 		if (ret) {
-			pr_debug("aio ioprio check cap error\n");
-			return -EINVAL;
+			pr_debug("aio ioprio check cap error: %d\n", ret);
+			return ret;
 		}
 
 		req->ki_ioprio = iocb->aio_reqprio;